Twitter is killing off TweetDeck. TweetDeck just announced that it'll be discontinuing its iPhone app, Android app and versatile Air-based multicolumn desktop app. The apps will be removed from all the app stores and stop working "shortly thereafter". Bye, bye multi-column Twitter!

TweetDeck will now focus its effort on creating web app versions of TweetDeck. TweetDeck explained:

To continue to offer a great product that addresses your unique needs, we're going to focus our development efforts on our modern, web-based versions of TweetDeck. To that end, we are discontinuing support for our older apps: TweetDeck AIR, TweetDeck for Android and TweetDeck for iPhone. They will be removed from their respective app stores in early May and will stop functioning shortly thereafter. We'll also discontinue support for our Facebook integration.

If you want to jump in front of the bullet, you can download a Chrome version of TweetDeck right here. TweetDeck warns its users that over the next two months, TweetDeck apps will be experiencing "some outages". The apps will be pulled from their app stores in early May. [Tweetdeck]